DOI: 10.52150/2522-9117-2018-32-384-393

Kononenko Anna Andreevna, PhD (Engin.), Senior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: perlit@ua.fm, a_kononenko@inbox.ru ORCID 0000-0001-7446-4105

Puchikov Alexander Vladimirovich, Senior Researcher, Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107

Kuksa Oleg Volodimirovich, PhD (Engin.), Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107;

Snigura Iryna Romanivna, Junior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academic square Starodubova, 1, Dnipro, Ukraine, 49107

Physical and chemical models for expert evaluation of mechanical properties of structural steels

Abstract. The aim of the study is to develop an adapted methodology for assessing the influence of the chemical composition on the properties of multicomponent steels and finished rolled products. An approach to predicting the mechanical properties of structural steels with regard to heat treatment parameters, based on the concept of a directed chemical bond in the description of interatomic interaction in the melt, is presented. The physico-chemical models of the structure of the melts, which interconnect their composition, structure, and properties, were developed in the Iron and Steel Institute of NAS Ukraine. The representation of the element-by-element composition of multicomponent steels in the integral parameters of the interatomic interaction makes it possible to reduce the parametricity of the models. The role of various pairing interactions of alloying, microalloying and impurity elements in the formation of properties of steels and alloys was evaluated. A factor analysis has been carried out, the chemical composition of the steel has been structured into various subsystems. It is shown that the most significant subsystems are the matrix m (C, Si, Mn) and microalloying ml (Cr, Mo, V, Ni, Ti, Nb). For two samples of structural steels with significant technological differences and features (1-st group – low alloyed steels: St3sp, VSt3sp, VMSt3sp; 2-nd group: 09Г2ФБ, 10ХСНД, 15ХСНД, 14Г2САФ, 14Г2АФ, 16Г2АФ) dependencies of the type are obtained: σВ (σ0,2, δ5) = f (interatomic interaction parameters, Vcool).  It is shown that the most important parameters for calculating the σB, σ0.2 and δ5 matrix subsystem m are the integral parameters of the interatomic interaction d and Z Y , dm and tgαm, and for the microalloying subsystem ml – Z Y ml and dml, as well as the cooling rate Vcool for both subsystems. The developed semi-empirical models are recommended for expert assessment of the mechanical properties of structural steels and for use in automated control systems and automated process control systems.
Keywords: structural steels, mechanical properties, predictive models, interatomic interaction parameters, heat treatment parameters.

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